Dairy farm size is increasing in all regions of the
United States. In two of the largest dairy states, California and Wisconsin, mean herd sizes have increased 950% and 250%, respectively, since 1950. Dairy herds of 500 ...

Two experiments were performed using the same treatments. All heifers received two injections of PGF[subscript]2alpha 14 days apart. Controls then were inseminated after detected estrus. Heifers assigned to the two ...

Various programs of estrus synchronization have been tested during the last 6 years to determine the least costly and most efficacious for dairy heifer replacements. Four systems were tested: 1) a modified Ovsynch treatment ...